Rowland Tank No 1 Dam Reservoir Report
Last Updated: December 22, 2025
Rowland Tank No 1 Dam, located in McMullen County, Texas, serves as a vital water supply source in the region.
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Summary
Completed in 1968, this earth dam stands at a height of 16 feet with a length of 960 feet. It has a storage capacity of 500 acre-feet, providing essential water resources for the surrounding area. The dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections to ensure its structural integrity.
Despite its high risk assessment rating of 2, the dam's hazard potential is not available. The dam lacks a spillway and associated locks, with outlet gates being the only control mechanism in place. The condition assessment of Rowland Tank No 1 Dam has not been rated, highlighting the need for further evaluation and potential risk management measures. The dam's location on the TR-Ygnacio Creek adds to its importance in the local water resource landscape.
As a privately owned structure, Rowland Tank No 1 Dam plays a crucial role in water supply management for the surrounding area. With a surface area of 32 acres and a normal storage capacity of 141 acre-feet, the dam contributes significantly to the water needs of the region. Its presence on TR-Ygnacio Creek underscores its importance in sustaining the local ecosystem and providing essential water resources for various stakeholders. The dam's historical significance and ongoing regulatory oversight by TCEQ make it a key feature in the water resource and climate landscape of Texas.
Year Completed |
1968 |
Dam Length |
960 |
Dam Height |
16 |
River Or Stream |
TR-YGNACIO CREEK |
Primary Dam Type |
Earth |
Surface Area |
32 |
Hydraulic Height |
16 |
Nid Storage |
500 |
Structural Height |
16 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nueces Rv Nr Tilden
|
0cfs |
San Casimiro Ck Nr Freer
|
0cfs |
Frio Rv At Tilden
|
0cfs |
Lagarto Ck Nr George West
|
0cfs |
San Miguel Ck Nr Tilden
|
0cfs |
Choke Canyon Res Owc Nr Three Rivers
|
31cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Rowland Tank No 1 Dam